File content as of revision 0:3e143a2e21c8:

#include <stdbool.h>
#include "mbed.h"
#include "mcp4725.h"

/**
 * A basic test suite for the MCP4725 DAC Library.
 */

DigitalOut myled(LED1);
Serial pc(USBTX, USBRX);

void test_mcp4725_library(PinName sda, PinName scl, MCP4725::BusFrequency bus_frequency, int device_address_bits, char* testName);
int  test_init(MCP4725* interface, char* testName);
int  test_simple_read_write_no_eeprom(MCP4725* interface, enum MCP4725::PowerMode mode, int dac_value);
int  test_simple_read_write_with_eeprom(MCP4725* interface, enum MCP4725::PowerMode mode, int dac_value);
int test_eeprom_write_status(MCP4725* interface);

int main()
{
    pc.printf("Application for testing the MCP4725 interface library\r\n");
    
    test_mcp4725_library(p9, p10, MCP4725::Standard100kHz,  0, "p9, p10, MCP4725::Standard100kHz");
    test_mcp4725_library(p9, p10, MCP4725::Fast400kHz,      0, "p9, p10, MCP4725::Fast400kHz");
    test_mcp4725_library(p9, p10, MCP4725::HighSpeed3_4Mhz, 0, "p9, p10, MCP4725::HighSpeed3_4Mhz");

    while(1) {
        myled = 1;
        wait(0.5);
        myled = 0;
        wait(0.5);
    }
}



/** Run a set of simple tests on the mcp4725 driver.
     * 
     * @param sda I2C data line pin
     * @param scl I2C clock line pin
     * @param bus_frequency the frequency at which the I2C bus is running.
     * @param device_address_bits The 3bit address bits of the device.
     */
void test_mcp4725_library(PinName sda, PinName scl, MCP4725::BusFrequency bus_frequency, int device_address_bits, char* testName)
{
    //Create our instance of the interface for test
    MCP4725 mcp4725_interface(sda, scl, bus_frequency, device_address_bits);
    
    if(test_init(&mcp4725_interface, testName) == 0)
    {
        test_simple_read_write_no_eeprom(&mcp4725_interface, MCP4725::Normal, 3095);
        test_simple_read_write_no_eeprom(&mcp4725_interface, MCP4725::PowerDown1k, 2094);
        test_simple_read_write_no_eeprom(&mcp4725_interface, MCP4725::PowerDown100k, 2093);
        test_simple_read_write_no_eeprom(&mcp4725_interface, MCP4725::PowerDown500k, 92);
        test_simple_read_write_no_eeprom(&mcp4725_interface, MCP4725::Normal, 4095);
        
        test_simple_read_write_with_eeprom(&mcp4725_interface, MCP4725::Normal, 3095);
        test_simple_read_write_with_eeprom(&mcp4725_interface, MCP4725::PowerDown1k, 2094);
        test_simple_read_write_with_eeprom(&mcp4725_interface, MCP4725::PowerDown100k, 2093);
        test_simple_read_write_with_eeprom(&mcp4725_interface, MCP4725::PowerDown500k, 92);
        test_simple_read_write_with_eeprom(&mcp4725_interface, MCP4725::Normal, 4095);
        
        test_eeprom_write_status(&mcp4725_interface);
    }
    
    
}

/** Initialise the device registers & eeprom. */
int test_init(MCP4725* interface, char* testName)
{
    int result;
    pc.printf("Initialising test '%s': ", testName);
    
    //Prime the device, including its eeprom.
    result = interface->write(MCP4725::Normal, 0, true);
    if(result == 0)
    {
        wait(0.5);
        pc.printf("OK\r\n");
    }
    else
    {
        pc.printf("FAILED: %d\r\n", result);
    }
    
    return result;
}

/* Run a simple read/write test that does not write to eeprom. */
int test_simple_read_write_no_eeprom(MCP4725* interface, enum MCP4725::PowerMode mode, int dac_value)
{
    enum MCP4725::PowerMode read_mode;
    enum MCP4725::PowerMode read_mode_eeprom;//, write_mode_eeprom;
    int  read_dac_value;
    int  read_dac_value_eeprom;//, write_dac_value_eeprom;
    bool read_eeprom_write_in_progress;
    
    pc.printf("\tRead/write test without write to eeprom: ");
    
    interface->write(mode, dac_value, false);
    interface->read(&read_mode, &read_mode_eeprom, &read_dac_value, &read_dac_value_eeprom, &read_eeprom_write_in_progress);
    if( (mode != read_mode) || (dac_value != read_dac_value) || (read_eeprom_write_in_progress == true) || (read_dac_value == read_dac_value_eeprom) )
    {
        pc.printf("Failed - mode=%d, read_mode=%d, dac_value=%d, read_dac_value=%d, eeprom_write_state:%d\r\n", (int)mode, (int)read_mode, dac_value, read_dac_value, read_eeprom_write_in_progress);
        return 1;
    }
    else
    {
        pc.printf("Passed\r\n");
        return 0;
    }
}


/* Run a simple read/write test that does write to eeprom. */
int test_simple_read_write_with_eeprom(MCP4725* interface, enum MCP4725::PowerMode mode, int dac_value)
{
    enum MCP4725::PowerMode read_mode;
    enum MCP4725::PowerMode read_mode_eeprom;//, write_mode_eeprom;
    int  read_dac_value;
    int  read_dac_value_eeprom;//, write_dac_value_eeprom;
    bool read_eeprom_write_in_progress;
    
    pc.printf("\tRead/write test with write to eeprom: ");
    
    interface->write(mode, dac_value, true);
    
    wait(0.5); //Wait a short period for the eeprom write to complete.
    interface->read(&read_mode, &read_mode_eeprom, &read_dac_value, &read_dac_value_eeprom, &read_eeprom_write_in_progress);
    
    if( (mode != read_mode) || (dac_value != read_dac_value) || (read_eeprom_write_in_progress == true) || (read_dac_value != read_dac_value_eeprom) || (read_mode != read_mode_eeprom) )
    {
        pc.printf("Failed - mode=%d, read_mode=%d, dac_value=%d, read_dac_value=%d, eeprom_write_state:%d\r\n", (int)mode, (int)read_mode, dac_value, read_dac_value, read_eeprom_write_in_progress);
        return 1;
    }
    else
    {
        pc.printf("Passed\r\n");
        return 0;
    }
}

/** Test to see if the eeprom write status bit is reported correctly. */
int test_eeprom_write_status(MCP4725* interface)
{
    enum MCP4725::PowerMode read_mode;
    enum MCP4725::PowerMode read_mode_eeprom;//, write_mode_eeprom;
    int  read_dac_value;
    int  read_dac_value_eeprom;//, write_dac_value_eeprom;
    bool read_eeprom_write_in_progress;
    
    pc.printf("\tTest eeprom write status: ");
    
    interface->write(MCP4725::Normal, 4095, true);
    
    //Immediately read the device
    interface->read(&read_mode, &read_mode_eeprom, &read_dac_value, &read_dac_value_eeprom, &read_eeprom_write_in_progress);
    
    if( read_eeprom_write_in_progress == false )
    {
        pc.printf("Failed - EEPROM Write not reported as in progress.\r\n");
        return 1;
    }
    else
    {
        wait(0.5); //Wait a short period for the eeprom write to complete.
        interface->read(&read_mode, &read_mode_eeprom, &read_dac_value, &read_dac_value_eeprom, &read_eeprom_write_in_progress);
        
        if( read_eeprom_write_in_progress == false )
        {
            pc.printf("Passed\r\n");
            return 0;
        }
        else
        {
            pc.printf("Failed - EEPROM Write reported as still in progress.\r\n");
            return 1;
        }
    }
}